[Users] Different result in buffer zone at iteration 1 only on Gauss

[Yosef Zlochower]

Hi,

   When  I tried to run the testsuites on the RIT thorns, the
testsuite failed due to an issue at iteration 1, that then
disappears.  For certain analysis quantities like the Hamiltonian
constraint violation and psi4, I find differences in every other
bufferzone point between Orsted and Gauss. However, this only occurs
at iteration 1 ( my test ran for 16 iterations)

My test uses two levels (fixed) of refinement and a relatively
coarse grid. On the other hand, I don't see this at all in the
adm metric. Where there changes to the prolongation operators that
may explain this?


My test used 6 buffer zones (there were 4 ghostzones).
Here are the relevant Carpet parameters

Carpet::domain_from_coordbase       = yes
Carpet::prolongation_order_space   = 5
Carpet::prolongation_order_time    = 2
Carpet::max_refinement_levels      = 2
Carpet::use_buffer_zones = yes
Carpet::num_integrator_substeps = 1
Carpet::additional_buffer_zones = 2
Carpet::verbose           = no
Carpet::schedule_barriers = no
Carpet::veryverbose       = no
Carpet::init_fill_timelevels = "yes"

ActiveThorns="CarpetRegrid2"
CarpetRegrid2::regrid_every = 16
CarpetRegrid2::num_centres = 1
CarpetRegrid2::num_levels_1 = 2
CarpetRegrid2::radius_1[ 1] = 5
-- 
Dr. Yosef Zlochower
Center for Computational Relativity and Gravitation
Assistant Professor
School of Mathematical Sciences
Rochester Institute of Technology
85 Lomb Memorial Drive
Rochester, NY 14623

Office:74-2067
Phone: +1 585-475-6103

yosef at astro.rit.edu

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